Abstract:

The first method of lithium hydride freeze-crystallization denitrification is the batch process and equipment.The process has many disadvantages,such as higher content of impurities（such as SO₄ ^2-） in the frozen mother liquor,large amount of liquid attached to the Glauber′s salt crystal,and more lithium loss.The continuous production process and equipment of lithium hydride freeze-crystallization denitrification was introduced.By using continuous production process and equipment,the content of SO₄ ^2- in the frozen mother liquor was reduced from 45~50 g/L to 35~40 g/L,and the liquid content of the Glauber′s salt crystal was reduced from about 10% to about 5%.It can reduce the energy consumption of subsequent lithium hydroxide production and increase the recovery rate of lithium.

Key words: lithium hydroxide, continuous production process, freezing crystallization denitrification, equipment